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| author | Wolfram Sang <w.sang@pengutronix.de> | 2011-12-13 18:34:01 +0100 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2012-04-06 06:24:06 +0200 |
| commit | fc3a1f04f5040255cbc086c419e4237f29f89f88 (patch) | |
| tree | 3ece85d636a3ceeffb157b77ee51b4745cbdf2d9 /Documentation/gpio.txt | |
| parent | Linux 3.4-rc1 (diff) | |
| download | linux-fc3a1f04f5040255cbc086c419e4237f29f89f88.tar.xz linux-fc3a1f04f5040255cbc086c419e4237f29f89f88.zip | |
gpio: add flags to export GPIOs when requesting
Introduce new flags to automatically export GPIOs when using the convenience
functions gpio_request_one() or gpio_request_array(). This eases support for
custom boards where lots of GPIOs need to be exported for customer
applications.
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'Documentation/gpio.txt')
| -rw-r--r-- | Documentation/gpio.txt | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/gpio.txt b/Documentation/gpio.txt index 620a07844e8c..e08a883de36e 100644 --- a/Documentation/gpio.txt +++ b/Documentation/gpio.txt @@ -322,6 +322,9 @@ where 'flags' is currently defined to specify the following properties: * GPIOF_OPEN_DRAIN - gpio pin is open drain type. * GPIOF_OPEN_SOURCE - gpio pin is open source type. + * GPIOF_EXPORT_DIR_FIXED - export gpio to sysfs, keep direction + * GPIOF_EXPORT_DIR_CHANGEABLE - also export, allow changing direction + since GPIOF_INIT_* are only valid when configured as output, so group valid combinations as: |